# encoding:utf-8
# -*- coding:utf-8 -*-
#
#   author: iflytek
#
#  本demo测试时运行的环境为：Windows + Python3.7
#  本demo测试成功运行时所安装的第三方库及其版本如下：
#   cffi==1.12.3
#   gevent==1.4.0
#   greenlet==0.4.15
#   pycparser==2.19
#   six==1.12.0
#   websocket==0.2.1
#   websocket-client==0.56.0
#   合成小语种需要传输小语种文本、使用小语种发音人vcn、tte=unicode以及修改文本编码方式
#  错误码链接：https://www.xfyun.cn/document/error-code （code返回错误码时必看）
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
import websocket
import datetime
import hashlib
import base64
import hmac
import json
from urllib.parse import urlencode
import ssl
from wsgiref.handlers import format_date_time
from datetime import datetime
from time import mktime
import _thread as thread
import os
import wave
import numpy as np
import threading

close_event = threading.Event()

STATUS_FIRST_FRAME = 0  # 第一帧的标识
STATUS_CONTINUE_FRAME = 1  # 中间帧标识
STATUS_LAST_FRAME = 2  # 最后一帧的标识


class Ws_Param(object):
    # 初始化
    def __init__(self, APPID, APIKey, APISecret, Text):
        self.APPID = APPID
        self.APIKey = APIKey
        self.APISecret = APISecret
        self.Text = Text

        # 公共参数(common)
        self.CommonArgs = {"app_id": self.APPID}
        # 业务参数(business)，更多个性化参数可在官网查看
        self.BusinessArgs = {"aue": "raw", "auf": "audio/L16;rate=16000", "vcn": "xiaoyan", "tte": "utf8"}
        self.Data = {"status": 2, "text": str(base64.b64encode(self.Text.encode('utf-8')), "UTF8")}
        #使用小语种须使用以下方式，此处的unicode指的是 utf16小端的编码方式，即"UTF-16LE"”
        #self.Data = {"status": 2, "text": str(base64.b64encode(self.Text.encode('utf-16')), "UTF8")}

    # 生成url
    def create_url(self):
        url = 'wss://tts-api.xfyun.cn/v2/tts'
        # 生成RFC1123格式的时间戳
        now = datetime.now()
        date = format_date_time(mktime(now.timetuple()))

        # 拼接字符串
        signature_origin = "host: " + "ws-api.xfyun.cn" + "\n"
        signature_origin += "date: " + date + "\n"
        signature_origin += "GET " + "/v2/tts " + "HTTP/1.1"
        # 进行hmac-sha256进行加密
        signature_sha = hmac.new(self.APISecret.encode('utf-8'), signature_origin.encode('utf-8'),
                                 digestmod=hashlib.sha256).digest()
        signature_sha = base64.b64encode(signature_sha).decode(encoding='utf-8')

        authorization_origin = "api_key=\"%s\", algorithm=\"%s\", headers=\"%s\", signature=\"%s\"" % (
            self.APIKey, "hmac-sha256", "host date request-line", signature_sha)
        authorization = base64.b64encode(authorization_origin.encode('utf-8')).decode(encoding='utf-8')
        # 将请求的鉴权参数组合为字典
        v = {
            "authorization": authorization,
            "date": date,
            "host": "ws-api.xfyun.cn"
        }
        # 拼接鉴权参数，生成url
        url = url + '?' + urlencode(v)
        # print("date: ",date)
        # print("v: ",v)
        # 此处打印出建立连接时候的url,参考本demo的时候可取消上方打印的注释，比对相同参数时生成的url与自己代码生成的url是否一致
        # print('websocket url :', url)
        return url


def convert_pcm_to_wav(input_pcm, output_wav, sample_rate=16000):
    # 读取 PCM 数据
    with open(input_pcm, 'rb') as pcm_file:
        pcm_data = pcm_file.read()

    # 将 PCM 数据转为 numpy 数组
    audio_array = np.frombuffer(pcm_data, dtype=np.int16)

    # 创建 WAV 文件
    with wave.open(output_wav, 'wb') as wav_file:
        wav_file.setnchannels(1)  # 单声道
        wav_file.setsampwidth(2)  # 16 位采样对应 2 字节
        wav_file.setframerate(sample_rate)  # 采样率
        wav_file.writeframes(audio_array.tobytes())
    # print(f"转换完成：{output_wav}")


def text2wav(text, file_path):
    file_name = os.path.basename(file_path).rstrip('wav')
    pcm_f = os.path.join('audio_cache', file_name + 'pcm')

    def on_message(ws, message):
        try:
            message = json.loads(message)
            code = message["code"]
            sid = message["sid"]
            audio = message["data"]["audio"]
            audio = base64.b64decode(audio)
            status = message["data"]["status"]

            if status == 2:
                # print("ws is closed")
                ws.close()
            if code != 0:
                errMsg = message["message"]
                # print("sid:%s call error:%s code is:%s" % (sid, errMsg, code))
            else:

                with open(pcm_f, 'ab') as f:
                    f.write(audio)

        except Exception as e:
            print("receive msg,but parse exception:", e)

    # 收到websocket错误的处理
    def on_error(ws, error):
        print("### error:", error)

    # 收到websocket关闭的处理
    def on_close(ws):
        close_event.set()
        # print("### closed ###")

    # 收到websocket连接建立的处理
    def on_open(ws):
        def run(*args):
            d = {"common": wsParam.CommonArgs,
                 "business": wsParam.BusinessArgs,
                 "data": wsParam.Data,
                 }
            d = json.dumps(d)
            # print("------>开始发送文本数据")
            ws.send(d)
            if os.path.exists(pcm_f):
                os.remove(pcm_f)

        thread.start_new_thread(run, ())


    wsParam = Ws_Param(
        APPID='1d4453d1',
        APISecret='MDBhN2MxMzBjODhiOTczYjc1MGQzOTQ0',
        APIKey='018f746f0ac53ca88ba55d3d9ff0f760',
        Text=text,
    )
    websocket.enableTrace(False)
    wsUrl = wsParam.create_url()
    ws = websocket.WebSocketApp(wsUrl, on_message=on_message, on_error=on_error, on_close=on_close)
    ws.on_open = on_open
    ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})
    close_event.wait()

    convert_pcm_to_wav(pcm_f, file_path)


if __name__ == "__main__":
    text2wav('哈哈哈', '../ab.wav')
    # 测试时候在此处正确填写相关信息即可运行
    # wsParam = Ws_Param(
    #     APPID='1d4453d1',
    #     APISecret='MDBhN2MxMzBjODhiOTczYjc1MGQzOTQ0',
    #     APIKey='018f746f0ac53ca88ba55d3d9ff0f760',
    #     Text="这是一个语音合成示例"
    # )
    # websocket.enableTrace(False)
    # wsUrl = wsParam.create_url()
    # ws = websocket.WebSocketApp(wsUrl, on_message=on_message, on_error=on_error, on_close=on_close)
    # ws.on_open = on_open
    # ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})


